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Researchers found that butterflies first appeared somewhere in central and western North America 100 million years ago.
Wanderer Butterfly - The Australian Museum
Butterflies evolved from moths about 100 million years ago in North America : NPR
Monarch butterfly, Life Cycle, Caterpillar, Migration, Endangered, & Facts
The Evolution of the Butterfly
DNA analysis reveals butterfly and moth evolutionary relationship
How Butterflies Work
Life Cycle of a Butterfly Lesson for Kids - Video & Lesson Transcript
The Quantum Butterfly Noneffect
How does a caterpillar turn into a butterfly? - Discover Wildlife
What Butterflies' Colorful Wing Patterns Can Teach Us About Evolution, At the Smithsonian
Why Do Caterpillars Turn Into Butterflies? - Owlcation
What Butterflies' Colorful Wing Patterns Can Teach Us About Evolution, At the Smithsonian
Transformations: Which Caterpillar Becomes…, Summer 2010, Articles